Workshop Technology
In a four high rolling mill, there are four rolls out of which

One is working roll and three are backing up rolls
All of the four are working rolls
Three are working rolls and one is backing up roll
Two are working rolls and two are backing up rolls

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Workshop Technology
Rotary swaging

Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Is extensively used for making bolts and rivets
Is used for reducing the diameters of round bars and a tube by rotating dies which open and close rapidly on the work
Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part

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